Any smog experts out there?

Stolen from wiki;

In atmospheric chemistry, NOx is shorthand for nitric oxide (NO) and nitrogen dioxide (NO
2), the nitrogen oxides that are most relevant for air pollution.[1][2] These gases contribute to the formation of smog and acid rain, as well as affecting tropospheric ozone.

NOx gases are usually produced from the reaction between nitrogen and oxygen during combustion of fuels, such as hydrocarbons, in air; especially at high temperatures, such as in car engines.[1][2][3] In areas of high motor vehicle traffic, such as in large cities, the nitrogen oxides emitted can be a significant source of air pollution.